This genuine Ruger® factory magazine with Ruger logo has been tested and has proven to feed as reliably as the standard BX-1™ 10-round Ruger® rotary magazine. BX-15® magazines will work with any factory original 10/22® Rifle, SR-22® Rifle, 22 Charger™ Pistol, .22 LR Ruger American Rimfire® Rifle and .22 LR Ruger 77/22® Rifle.